Gas-stove.



G. F. & F. L. GRADY GAS STOVE.

APPLICATION FILED no. a, 1900.

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Patented Mar.

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c. F. M". L. "GRADY. GAS STOVE.

APPLICATION FILED D110. 8. 1909.

Patented Mar. 31, 1914,

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ms STOVE. APPLICATION FILED D30. 8, 1909.

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CHARLES F. GRADY AND FRANK L. GRADY. OF BUFFALO, NEW YORK, ASSIGNORS, BYMESNE ASSIGNMENTS, TO JEWETT & COMPANY, OF BUFFALO, NEW YORK, A (303-.

PORATION OF NEW YORK.

GAS-STOVE.

Specification of Letters Patent.

Patented Mar. 31, 1914.

To all 10710111 it may concern Be it. known that we, CHARLES F. GRADYand Fran; L. GRADY, citizens of the United States. residing at Buffalo,in the county of Erie and State of New York, have invented a new anduseful Improvement in Gas- Stoves, of which the following is aspecification.

The object of this invention is to produce a gas stove which hasimproved means for supplying the air to the burners. for concentrating,retaining and intensifying the heat and for ventilating the oven and inwhich the burners are capable of adjustment, so that the same may bereadily converted for burning either natural or artificial gas to thebest advantage.

In the accompanying drawings consisting of 3 sheets :Figure 1 is ahorizontal section of a stove embodying our improvements the same beingtaken in line 1- -1, Fig. 2. Fig. 2 is a vertical transverse section inline 2-2, Fig. 1. Figs. 3 and 4 are vertical longitudinal sections inthe correspondingly numbered lines in Fig. 1. Fig. 5 is a fragmentaryvertical longitudinal section, similar to Fig. 3, showing the burner ina different position. Fig. 6 is a fragmentary vertical transversesection in line 66, Fig. r. Fig. 7 is a view similar to Fig. 6 butshowing a modification in the manner of constructing the oven flue. Fig.8 is a vertical longitudinal section, similar to Fig. 4, taken in line8-8, Fig. 9, and showing a modified construction of the air supply flueand oven ventilating flue. Fig. 9 is a vertical transverse section inline 99, Fig. 8. Fig. 10 is a fragmentary vertical transverse section inline 10-10, Fig. 8. Fig. 11 is a fragmentary vertical longitudinalsection, similar to Figs. 4 and S, and showing a modified constructionof the manner of connecting the oven ventilating flue with the chimneypipe. Fig. 12 is a fragmentary sectional elevation showing amodification in the man ner of adjusting the burner in the shield. Fig.13 is a top plan view of the burner shown in Fig. 12. Fig. 14 is afragmentary horizontal section in line l t-4%, Fig. 4, on a reducedscale.

Similar letters of reference indicate corresponding parts throughout theseveral views.

Referring to Figs. 16, A indicates the bottom, B, B the side walls, Bthe rear wall, B the front wall, .and C the top of the hollow stove bodyor burner box which rests with its bottom on the oven D. At the rear endof the body the same has the usual rearwardly off-set conduit 6 andcollar 6 for connection with the stove pipe leading to the chimney whennatural gas is used. The top of the stove body is provided with theusual holes or openings f over which the cooking dishes are set, whichopenings may be closed by lids F if desired. The number of lid openingsin the top may be varied but as shown in the drawings four are employed,two on each side and one behind the other.

G represents an upright partition arranged transversely in the rear partof the space within the body and engaging the bottom thereof butstopping at its upper end short of the top, forming a main transverseoutlet passage or flue g in the body between the partition and the rearwall B of the body, and a narrow passageway between the upper end of thepartition and the top of the body. Below each top opening 7 the bottomis provided with an air inlet open ing H.

I represents a plurality of circular bowls, guards or shields each ofwhich is preferably dish-shaped and meets the bottom at its lower narrowend in line with one of the openings therein while its upper large endis in line with the companion opening in the top and communicates withthe surrounding flue chamber or burner box within the body. Although theshields may be made in various ways, it is preferable to cast themintegrally with the top and estab lish communication between the burnerchambers in the shields and the surrounding flue chamber by means ofannular rows of outlet openings 72- formed in the upper parts of theshields. as shown in Figs. 15.

TVithin each of the shields is arranged a burner I preferably ofcircular form, which is supplied with a mixture of air and gas by atubular shank or branch pipe 2' arranged lengthwise in the body andconnected at its rear end with the burner while its front end isprovided externally of the body with a valve 2' and an air mixer 11 andconnected with a transverse pipe section J. Air is supplied to theburners by means of two air. channels or conduits K, K which arearranged lengthwise side by side underneath the bottom of the body andeach of which is constructed in the form of an upwardly opening troughand communicates with two burner openings in the bottom. These troughsare secured with their upper edges to the underside of the body bottomand have their front ends opening to the external atmosphere preferablythrough the front of the stove while their rear ends are closed, asshown in Fig. 3.

When burning natural gas it is necessary to .arrange the burner acomparatively greater distance below the top of the stove than whenburning artificial gas on account of the greater pressure at whichnatural gas is supplied and also to insure mixture of the natural gaswith the proper volume of air to produce complete combustion of thegaseous 'fuel and avoid the odors of unconsumed gas and also to burn thefuel more advantageously. When burning artificial gas, the burner isarranged higher or nearer the top of the stove, so as to compensateforthe reduced gas pressure and also bring the flame which burns morereadily and with less air near the cooking dishes.

For the purpose of permitting the burner to be readily and quicklyshifted either into an elevated or depressed position relatively to thetop'for adapting the same to be used either with artificial or naturalgas, the following means are provided z-L represents a rear supportingarm projecting from the rear side of each burner and adapted to besecured either to the underside of a downwardly facing shoulder or lug Zon the outer side of the respective shield or the upper side of anupwardly facing upper shoulder or lug Z on the inner side of the shield,the preferred fastening for this purpose consisting of a bolt m passingvertically .through said arm and an opening m formed in said lugs Z, ZAdjacent to the front of the burner its branch gas supply pipe 2' isprovided on opposite sides with laterally projecting arms 0, 0 which areadapted to engage either with the underside of the lower shoulders orlugs .79, p on the exterior of the respective shield on opposite sidesof the branch pipe, or with the upper sides of upper lugs g, g arrangedon the inner side of the shield in line with the lower lugs 2, p Une ofthe laterally projecting arms is secured in either of the above mentioned positions preferably by a bolt Q passing vertically through saidarm and an opening formed in the respective pair of upper and lower lugsbut the other laterally projecting arm merely engages one-or the otherof its companion shield lugs and operates to steady ,the branch pipe andburner and hold the same against displacement.

hen burning natural gas, the burner an its tubular shank or branch pipeare lowered and held in this position byengaging the arms L, 0, 0 withthe undersides of the lugs Z, 3), p and securing the same by the boltsm, Q, as shown in Figs 2, 3 and 4. When burning artificial gas theburner and its branch pipe are raised and the arms L, 0, 0 are engagedwith the upper sides of the lugs Z 9, 9 as shown. in Fig. 5, and held inplace by the same bolts m, Q. In either its raised or lowered positionthe burner is separated by an annular space of substantially the samewidth from the lower edge of the shield, so that the amount of airsupplied to the burner is practically the same either in its raised orlowered position.

To permit of thus raising and lowering the burner and its gas supplypipe, the adj acent part of the shield is provided with a vertical slotR which receives the branch pipe '5. In the lowered position of theburner and branch pipe this slot is practically closed, so as to preventundue entrance of air to the shield by a cover 9" fitting in said slotand resting on top of the branch pipe and held against displacement by alug r arranged at its upper end and engaging with this inner side of theshield and a plurality of laterally projecting lugs r arranged on theouter side of said cover and engaging with the outer side of the shield,as shown in Figs. 2 and 3. In the raised position of the burner andsupply pipe the cover 1" is removed and the slot R is practically closedI by the branch pipe of the burnefwhich occupies this slot in the raisedposition of the burner. This provision for rendering the stove capableof use either with natural or artificial gas renders it unnecessary forthe dealer to keep two kinds of stoves in stock, inasmuch as he canreadily adapt the stove so that it can be used with either kind of gas.To permit of thus changing the burner for use with either artificial ornatural gas at any time, the transverse pipe J is connected by arearwardly extending vertically swinging pipe section y with a mainsupply pipe J as shown in Figs. 1 and 2, one of said pipe sections beingprovided .with a hand valve j for turning ofi the gas, from all theburners when desired.

For the purpose of ventilating the bake oven, a due S is provided whichconnects the top of the oven with the chimney flue or stove pipe. ltnits preferred form this oven ventilating flue is constructed by means ofa horizontal plate 8 which extends lengthwise from the front wall to therear wall of the oven,as shown in Fig. l, and bridges the space betweenthe two air conduits for the burners, as shown in Fig. 2, and side walls8 s as shown in Fig. 6. The side walls 8 s are arranged between the rearends of the air conduits and the rear wall of the oven, as shown in Fig.14 and form a continuation of the oven flue in rear of the burner airchannels or fines. The plate may be held in place by vertical bolts 6connecting the same with the bottom of the stove body, as shown in Figs.1, 2, at and 6.

Instead of forming the side walls of the rear part of the oven flue onthe bottom of the stove body these walls, as shown at 8 Fig. 7 may beformed on the bottom plate .9 of the oven flue.

The vapors and spent gases pass from the bake oven upwardly throughopenings 2 in the bottom plate 8 of the oven flue, thence rearwardlythrough the latter and thence upwardly through an opening i in thebottom plate A in rear of the partition G and into the main flue 9leading to the stove or chimney pipe.

Instead of making the air supply conduit or channel for the burners intwo sections, as shown in Fig. 2, a single conduit or channel K may beemployed to supply air to all of the burners, as shown in Fig. 9. Inthis construction the oven flue S is constructed in the form of a troughwhich engages at its upper edges with the underside of the one piece airconduit and is turned upwardly in rear of this conduit, as shown in Fig.8, so as to conduct the oven vapors entering the inlet openings 16 tothe outlet opening 2 in the stove body bottom leading to the stove orchimney pipe or fine.

If desired, the vapors from the oven may be carried from the rear end'of the oven flue S through an opening a in the rear wall of the oven andthence upwardly, a flue extenslon a being formed on the rear wall of theoven and leading to the stove pipe, as shown in Fig. 11.

Instead of effecting the vertical adjustment of the burners by the meansshown in Figs. 15, 8 and 9, this may be effected by the means shown inFigs. 12 and 13 and which consist of a pair of upper lugs w, l)

and a pair of lower lugs 20, w arranged on' the upper and lower part ofthe burner I either one or the other pair of said lugs being adapted toengage with the edge of the bottom A of the hollow stove body or burnerbox. Upon engaging the upper lugs 0, Q) with the bottom A, as shown byfull lines in Fig. 12 the burner will set low in the shield, whereas ifthe lower lugs to, w are engaged with the bottom, the burner will sethigh in the shield, thereby permitting of adapting the burner for useboth with natural or artificial gas.

lVe claim as our invention:

1. A stove comprising a body having a top provided with a cookingopening and a bottom provided with an air inlet opening, a shieldarranged between the top and bottom in line with the openings thereof.and a burner arranged in the shield, said shield and burner having meansfor adjusting the burner vertically in the shield comprising an armmoving with the burner and adapted to be secured either to the exterioror the interior of said shield.

2. A stove comprising a body having a top provided with a cookingopening and a bottom provided with an air inlet opening. a shieldarranged between the top and bottom in line with the openings thereof,and a burner arranged in the shield, said shield and burner having meansfor adjusting the burner vertically in the shield comprising lugsarranged on the exterior and interior of the shield and an arm movingwith the burner and adapted to be secured either to the underside of thelug on the exterior of the shield or to the upper side of the lug on theinterior of the shield.

3. A stove comprising a body having a top provided with a cookingopening and a bottom provided with an air inlet opening, a shieldarranged between the top and bottom in line with the openings thereof, aburner arranged in the shield and a fuel tube connected with the burner,said shield and burner having means for adjusting the burner verticallyin the shield comprising two pairs of lugs the members of each pairbeing arranged on the exterior and interior of the shield, an armarranged on the burner and adapted to be secured to the external orinternal member of one of said pairs of lugs, and an arm arranged on thefuel tube and adapted to be secured to the internal or external memberof the other pair of said lugs.

4. A stove comprising a body having a top provided with a cookingopening and a bottom provided with an air inlet opening, a shieldarranged between the top and bottom in line with the openings thereofand having a vertical slot, a burner arranged in said shield and havinga fuel supply tube arranged in the slot, said burner and shield havingmeans for adjusting the said burner and its pipe vertically, and a coverfor closing said slot in the lowered position of the burner and pipe.

5. A stove comprising a hollow body having a top and bottom providedwith coinciding burner openings, and also having a stoye pipe collar,and a partition between sa d burner openings and said collar, and saidbottom being provided between the partition and collar with aventilating opening which communicates with said collar, burnersarranged in line with said burner openings, two air flues or supplychannels arranged side by side under said bottom and leading to theburner openings therein, an

oven arranged below said body, and an oven flues to the rear Wall of theoven and ar- 10 ventilating flue leading from the top of the ranged onopposite sides of said plate.

oven to the ventilating opening in said bot- Witness our hands this 6thday of Decemtom and having an opening whereby the ber, 1909.

5 ventilating flue communicates with the oven CHARLES F. GRADY.

and consisting of a plate extending from the V FRANK L. GRADY. front tothe rear Wall of the oven and bridg- Witnesses: ing the space betweensaid air fines, and side EUGENE P. OUoHIE,

walls extending from the rear of said air TZEEO. L. PoPP.

